Enable Non-Owner Mailbox Access Auditting – Exchange Online

One of the Office 365 Security recommendations is to enable auditing for non-owner mailbox access in Exchange Online. This should then be reviewed on a scheduled basis, i.e. weekly, to make sure other people are not snooping on mailboxes.

Let’s walk through how you can do this in Powershell for ALL mailboxes in your Exchange Online subscription

Because you should have MFA enabled for any Admin accounts in your subscription, we need to download the Exchange Online Remote Powershell module.

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